Heb. The fixed thought or mind (i.e. the man whose mind and thoughts are fixed and settled upon thee by faith as the next clause explains it, the qualifications being put for the person so qualified, as folly and wisdom are put for a fool and a wise man, Proverbs 24:9 Micah 6:9, and peace for a man of peace, Psalms 120:7) thou wilt keep in peace, peace, i.e. in all manner of peace, in constant and perfect peace. In the foregoing verse the righteous were admitted into the city, and here they were preserved and defended in it by God's almighty power.
Related Commentaries of Isaiah 26:3
Isaiah 26:3
3 Thou wilt keep him in perfectb peace, whose mind is stayed on thee: because he trusteth in thee.